Exhaust chimney fan's WKO type purpose is taking the fumes out of wood boiler. WKO type fans are characteristic for great efficiency, low volume and weight.

Exhaust chimney fan WKO type succours chimney flue while burning up in a natural thrust boiler or in a fan boiler. It's also helpful while fuel loading in the time of door opening. Both the functions are to prevent against smoke getting out of a boiler in low thrust time.